Process for producing polyethylene or EPR and catalyst system therefor

摘要

A process for the production of polyethylenes or EPRs comprising contacting a mixture comprising ethylene, one or more alpha-olefins, and, optionally, a diene, with a catalyst comprising: (A) as a precursor, the reaction product of VX3 and an electron donor; as a modifier, AlR(3-a)Xa; and a support; and (B) as a cocatalyst, AlR(3-a)Xa; and (C) as a promoter, a saturated or unsaturated aliphatic halocarbon having at least 3 carbon atoms and at least 6 halogen atoms.